语法:IF

#!/usr/bin/env python
# -*- coding: utf-8 -*-

l = [2,3,4,9]

if 1 in l:
    print 1, "in the list"
elif 2 in l:
    print 1,"NOT in the list"
    print 2, "in the list"
else:
    print 1,2,"NOT in the list"

运行结果:

% python gramma/if.py                                                       ✭
1 NOT in the list
2 in the list